"After the fact, I actually found out that they threw the challenge so that they could get me out," Sandra told Reality TV World in an exclusive interview Thursday.

"I actually had to laugh about it, like of all the ways you could get rid of me, why throw a challenge? Like, really? Are you that fearful of me, especially me at a challenge? Like come on! But they were just scared of me."

The Immunity Challenge in Wednesday night's episode required the Nuku and Mana tribes to each cross monkey bars, pull a heavy sled filled with large barrels through the sand, and then solve a barrel puzzle.

"I wish we hadn't lost that challenge, but with me and Varner pulling the rope, from what I understand, they really weren't pulling and they didn't want to get to the mat and they didn't want no one getting near the puzzle until the other tribe won," Sandra explained.

The two-time Survivor winner admitted she had no idea her tribe was throwing the challenge as it was happening, reiterating that she "found out after the fact." She was well aware, however, she was a huge -- if not the biggest -- threat in the game.

Another reason Nuku allegedly threw the Immunity Challenge?

The majority in the new Nuku tribe wanted to "also save their alliance members on the other side who were outnumbered by [Troy "Troyzan" Robertson], [Hali Ford], [Michaela Bradshaw] and [Aubry Bracco]. So it was a win-win for them -- lose the challenge and get rid of Sandra: 'She's been here one day too many. She's already been here [too long]. She should've been gone at the first Tribal Council, but she wasn't.'"

Sandra explained to Reality TV World, "So it was either they were going to get rid of me, or they were going to be truthful," referring to how her Nuku tribe told Varner and herself after the challenge they were going to vote out Tai at the next Tribal Council because he's so unpredictable and known to be a flipper.

"The only way to know that is to actually go to Tribal Council," she noted.

On her way out of the game, Sandra wished her tribe "good luck," and Survivorhost Jeff Probst laughed about how he was snuffing her torch for the first time in 94 days. Sandra previously won Survivor: Pearl Islands as well as Survivor: Heroes vs. Villains.